Please tell us more about the diode modules, PSUs, and other electronics in the build. Pictures of the build would be useful too. I’m guessing you have a rouge electrical problem resulting in a charge to your optical plate that’s screwing with multiple drivers and the galvo signal. I most commonly see this due to ungrounded inputs to the PSUs or faulty (like poor quality Chinese) PSUs. There could be two problems as well like poorly set bias and a signal issue to the galvos. More details are necessary to guide further.
David
"Help, help, I'm being repressed!"